gate is more versatile in the pipeline, a valve main connect and block medium. Does not apply to regulate the flow of medium, but can according to the size of discretion to determine flow rate of valve rod ( Such as fire scale seal gate valves equipped with opening and closing of the elastic base seat) 。 Gate compared to other valves, pressure, temperature, diameter and other requirements of the applicable range wants wide.

gate valve according to the internal structure of the different can be divided into: single wedge type gate type, flexible disc type, double disc type, parallel slide type.

depending on the valve stem stents can be divided into: rising stem gate valves and non-rising stem gate valves.

gate valve of the main performance advantages are:

1, the valve fluid resistance small, because the valve body is straight type, medium flow does not change direction, therefore more other valves flow resistance is smaller.

2, sealed performance is better stop valve, opening and closing also relatively effortless globe valve.

3, wide applicable scope, except for steam and oil such as media, also applies to contain granular solids and high viscosity medium, can also be applied to do the vent valve and valve to use of low vacuum system.

4, gate valve is a valve with double flow, the flow direction of medium is not subject to restriction, therefore is suitable for the medium may change the flow direction of pipeline, and ease of installation.

gate performance of main faults are:

1, high design size, the closed a long time. The need when open the valve plate to the upper valve cavity, closing and need all the valve plate to the seat, so the valve plate of lifting large travel, time is long.

2, because the two gate valves in the valve plate and valve seat sealing surface friction in the process of opening and closing, so the sealing surface is easy to scratch, has an effect on the sealing performance and service life, and not easy to repair.

gate performance comparison of several different structure:

( 1) Single wedge gate Industrial Valves

a, simple structure more flexible disc valve

b, at high temperature, sealed performance is not as good as elastic slide valve or double gate valve.

c, suitable for medium of high temperature anti-coking.

( 2) Flexible disc gate valves

a, it is a special form of wedge type single ram valve. When compared with wedge gate valve, high temperature, good seal performance, ram heated not easily stuck;

b, suitable for steam and hot oil and oil and gas medium, and is suitable for frequent switch parts.

c, does not apply to the medium of easy coking.

( 3) Double disc gate valves

a, sealed performance is good wedge gate valve, when the sealing surface of cooperate to be not very accurate Angle and seat, still has good sealing performance.

b, ram after sealing surface wear, the spherical centers at the bottom of the metal pad can be used after the replacement, generally don't have to be surfacing welding and grinding seal face, this is the single disc and flexible disc does not have advantages.

c, suitable for steam and hot oil and oil and gas medium, and is suitable for frequent switch parts.

d, does not apply to the medium of easy coking.

( 4) Parallel gate valve

a, sealed performance is worse than other forms of gate valves.

b, is suitable for low temperature and pressure medium.

c, disc and seat sealing surface processing and maintenance easier than other forms of gate valves.

the difference between rising stem gate valves and non-rising stem gate:

gate is through the valve lever lifting transmission gate opening and closing of the up and down, rising stem gate valves of transmission screw thread on the top of the stem stents, so by the position of the valve stem determine the open-close position of the ram, and the transmission thread also facilitate daily lubrication maintenance, at the same time from the fluid corrosion, the disadvantage is that the requirement to the installation space is larger.

non-rising stem gate drive screw thread from inside the body, saved the space of the valve rod support, so the whole valve height decreases. To clear the open-close position, it can be installed above the valve cover opening and closing scale, applicable to the sewer (under Such as underground non-rising stem gate valves) , pipeline and other places in the narrow space, or dust content in place.

gate valves can also be based on different material, different pressure and different seal and connection mode, can be divided into different gate types.

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